Adds the source: “It was such a low-key intimate party. Eva had an amazing night with her closest friends. It was maybe 40 people.”

Kardashian, for one, had a good time. She posted a photo of her and Klum in costume and Tweeted, “Me and my girl Heidi Klum getting [our] gangster on! I love this 20’s era!”

Next up on the Longoria birthday event calendar: A day at Disneyland and Disney California Adventure park with Cruz and a large group of family members on Tuesday. They took a sneak peek at construction progress on the new attraction, “The Little Mermaid – Ariel’s Undersea Adventure.”

“She was all smiles and looked gorgeous on her birthday,” says an onlooker of Longoria, who was spotted laughing, smiling and cuddling with Cruz during the visit.

From there, the gang headed over to nearby Buca di Beppo in Anaheim, where they dined on calamari, margherita pizza, fettuccine alfredo and baked ziti.

Cruz and Longoria, who were “very affectionate and seemed to be having a great time,” according to a source, capped the evening off with a brownie sundae.

But wait, there’s more: Longoria took to her Facebook page to reveal yet another birthday celebration. “Thank you everyone for the wonderful bday wishes! I’m celebrated with my family at the happiest place on earth! Disneyland!”

“But,” she added, “the real celebration will be in Vegas this weekend at Eve and Beso at City Center Friday Night! See you there!”